staging: vchiq_arm: remove hardcoded buffer length

We better use sizeof instead of hardcoding buffer length multiple
times. This make it easier to increase the buffer in the future.
In order to keep below 80 chars limit make the variable name shorter.
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c

@@ -2126,20 +2126,20 @@ static void
 output_timeout_error(VCHIQ_STATE_T *state)
 {
 	VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state);
-	char service_err[50] = "";
+	char err[50] = "";
 	int vc_use_count = arm_state->videocore_use_count;
 	int active_services = state->unused_service;
 	int i;
 
 	if (!arm_state->videocore_use_count) {
-		snprintf(service_err, 50, " Videocore usecount is 0");
+		snprintf(err, sizeof(err), " Videocore usecount is 0");
 		goto output_msg;
 	}
 	for (i = 0; i < active_services; i++) {
 		VCHIQ_SERVICE_T *service_ptr = state->services[i];
 		if (service_ptr && service_ptr->service_use_count &&
 			(service_ptr->srvstate != VCHIQ_SRVSTATE_FREE)) {
-			snprintf(service_err, 50, " %c%c%c%c(%d) service has "
+			snprintf(err, sizeof(err), " %c%c%c%c(%d) service has "
 				"use count %d%s", VCHIQ_FOURCC_AS_4CHARS(
 					service_ptr->base.fourcc),
 				 service_ptr->client_id,
@@ -2153,7 +2153,7 @@ output_timeout_error(VCHIQ_STATE_T *state)
 output_msg:
 	vchiq_log_error(vchiq_susp_log_level,
 		"timed out waiting for vc suspend (%d).%s",
-		 arm_state->autosuspend_override, service_err);
+		 arm_state->autosuspend_override, err);
 
 }